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Optimização eficiente do ganho espectral de amplificadores de Raman com bombage...
B. Neto; S. Stevan Jr.; R. Nogueira; A. L. J. Teixeira; M. J. N. Lima; P. S. AndréWe report the use of the Genetic Algorithm (GA) in the optimization of a distributed Raman amplifier spectralgain. The used methodology is based on the direct integrationof Raman propagation equations making use of the transfermatrix method, which ensue into a considerable reduction ofthe computation time. Pointing out an on/off Raman gain of10 dB, we develop a technique based in a combination of theGA with the...
Raman Amplifiers for Use in WDM Systems
D. B. M. Pereira; A. L. J. Teixeira; M. J. N. Lima; P. S. B. André; H. C. C. Fernandes; J. R. Ferreira da RochaIn this paper Raman Amplifiers (RAs) for Wavelength Division Multiplexed (WDM) fiber optic systems are analysed. We start by explaining the physical principles of this kind of amplification are explained, and the principal characteristics and advantages of using these amplifiers are enumerated.The technique of multiple pumping (MP) is studied aiming to obtain broadband amplifiers w...
Wideband Erbium-Doped Fiber Amplifier System Design Limitations due to Cband Si...
D. B. M. Pereira; A. L. J. Teixeira; M. J. N. Lima; P. S. B. André; J. R. Ferreira da RochaIn this paper we observe experimentally the effects of C-band pump light in the performances of an Lband Erbium-Doped Fiber Amplifier (EDFA). An amplifier for C+L-bands in a parallel configuration of two EDFAs is designed, and the inherent implications in its application to optical fiber communications systems. A new configuration is presented for decreasing the signal gain depende...
Thermally Tunable Bragg Grating Filtrers for Wavelength-Multiplexed Systems
M. J. N. Lima; O. Frazão; A. L. J. Teixeira; P. S. B. André; J. R. Ferreira da RochaIn this contribution we compare the thermal tuning capabilities of two type I gratings, considering an unloaded and a hydrogen-loaded fiber, and a type IIa grating. We further study their responses stability with temperature, analyzing their potential as optical filters in wavelength division multiplexing systems. We conclude that all of them have similar tuning efficiencies, howev...
Bragg Gratings with Enhanced Temperature Sustainability Written in a High- Germ...
M. J. N. Lima; R. N. Nogueira; J. C. C. Silva; A. L. J. Teixeira; P. S. B. André; J. R. F. da Rocha; J. H. Kalinowski; J. L. PintoIn this contribution we report the achievement offiber Bragg gratings exhibiting high temperaturesustainability, resultant from type IIA and a new abnormalexposition regimes, and compare their thermal stability withother gratings obtained from different growth mechanisms,namely type I and IA. It is expected that type IIA and thedesignated as abnormal gratings improve the reliability ofhigh-temperature grating-s...
Dispersion modeling a dynamic chromatic dispersion compensator based on Bragg g...
B. Neto; M. J. N. Lima; A. L. J. Teixeira; R. N. Nogueira; J. L. Pinto; J. R. F. da Rocha; P. AndréWe report a method to realize tunable chromatic dispersion compensation based on chirped fiber Bragg gratings (CFBG). The changes on the CFBG dispersion are achieved by controlling a temperature gradient applied to the grating. A thermodynamic model is presented enabling us to simulate the temperature distribution along the grating lenght. Furthermore, a theoretical approach was de...
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